U.S. patent number 4,416,564 [Application Number 06/315,975] was granted by the patent office on 1983-11-22 for hub and web assembly.
This patent grant is currently assigned to Valeo. Invention is credited to Rene Billet, Pierre Renaud.
United States Patent |
4,416,564 |
Billet , et al. |
November 22, 1983 |
Hub and web assembly
Abstract
A hub and web assembly such as for a clutch plate or pulley half
in which the outer component comprises a sleeve with a web and the
inner component a hub. The inturned terminal end of the sleeve
bears axially against a transverse shoulder to positively determine
the relative axial position of the components. Also, a bead formed
from the inner component is swaged against the opposite side of the
inturned terminal end. The length of the serrations on the sleeve
is shorter than the total length thereof. A cylindrical bearing
surface on the end of the sleeve adjacent the actual web bears
tightly against a corresponding cylindrical bearing surface on the
hub remote from the transverse shoulder. This arrangement permits
limited torsion of the web without loosening the mating serrations
on the components.
Inventors: |
Billet; Rene (Lamorlaye,
FR), Renaud; Pierre (Le Plessis-Trevise,
FR) |
Assignee: |
Valeo (Paris,
FR)
|
Family
ID: |
9247530 |
Appl.
No.: |
06/315,975 |
Filed: |
October 28, 1981 |
Foreign Application Priority Data
|
|
|
|
|
Oct 31, 1980 [FR] |
|
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80 23307 |
|
Current U.S.
Class: |
403/282; 192/207;
403/345; 403/359.6 |
Current CPC
Class: |
B23P
11/00 (20130101); F16D 1/072 (20130101); F16D
13/646 (20130101); Y10T 403/4966 (20150115); Y10T
403/70 (20150115); Y10T 403/7035 (20150115) |
Current International
Class: |
B23P
11/00 (20060101); F16D 1/072 (20060101); F16D
13/64 (20060101); F16D 1/06 (20060101); B25G
003/00 (); F16B 007/18 (); F16D 001/00 () |
Field of
Search: |
;403/345,282,359,263,165
;192/106.2,106.1 ;29/432,525,475 ;411/180 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Shedd; Wayne L.
Attorney, Agent or Firm: Brown; Charles E.
Claims
What is claimed is:
1. An assembly of two coaxial components comprising an inner
component defining a cylindrical hub and an outer component
including a sleeve having an axial drive fit onto said inner
component, one of said components having longitudinal broaching
serrations, substantially complementary serrations on the other of
said components having the appearance of being formed by said
broaching serrations, said broaching serrations and said
complementary serrations being intermeshed, the improvement wherein
said outer component has an inturned terminal end, and said inner
component has a transverse shoulder, said inturned terminal end
bearing axially against said transverse shoulder and positively
determines the axial position of said outer component on said inner
component.
2. The assembly defined in claim 1, further comprising axial
retaining means provided on said inner component bearing axially
against said inturned terminal end on the side opposite from said
transverse shoulder.
3. The assembly defined in claim 2, wherein said axial retaining
means comprises a swaged bead formed on said inner component.
4. The assembly defined in claim 1, wherein the length (e) of said
broaching serrations is substantially axially shorter than the
effective length (E) of said sleeve overlying said inner
component.
5. The assembly defined in claim 1, said component further
commprising a web integral with and extending outwardly from said
sleeve, wherein said broaching serrations are axially offset
relative to the position from which said web extends from said
sleeve.
6. The assembly defined in claim 1, further comprising a smooth
bearing surface on said outer component on the side of its
serrations opposite from said inturned terminal end and a bearing
surface on said inner component on the side of its serrations
opposite from said transverse shoulder, the first-mentioned bearing
surface being received on the second-mentioned bearing surface, one
of said bearing surfaces being smooth.
7. The assembly defined in claim 1, said inturned terminal end
being substantially radially inturned.
8. The assembly defined in claim 1, wherein said serrations are
formed on said inner component.
9. The assembly defined in claim 6, wherein the length (e) of the
said serrations is axially shorter than the distance (E) from said
smooth bearing surfaces to said transverse shoulder on said inner
component.
10. The assembly defined in claim 1, wherein said sleeve and said
inner component are in contact along a smooth cylindrical bearing
surface to the side of said serrations axially remote from said
transverse shoulder and between the side of said serrations axially
adjacent said transverse shoulder and said transverse
shoulders.
11. The assembly defined in claim 1, wherein said sleeve and said
inner component are in contact along a smooth cylindrical bearing
surface to the side of said serrations axially remote from said
transverse shoulder defining means for permitting slight torsional
movement of said outer component axially remote from said inturned
terminal end.
12. An assembly of two coaxial components comprising an inner
component defining a cylindrical hub and an outer component
including a sleeve fixed for rotation with said hub and a
transverse web extending from one end of said sleeve, one of the
components having longitudinal broaching serrations, substantially
complementary serrations on the other of said components, said
broaching serrations and said complementary serrations intermeshing
with each other for transmitting torque between said transverse web
and said hub, said outer component comprising an inturned terminal
end axially remote from said transverse web, and said inner
component comprising a transverse shoulder, said inturned terminal
end bearing axially against said transverse shoulder thus
positively determining the axial position of said inner component
relative to said outer component.
13. The assembly defined in claim 12, further comprising axial
retaining means provided on said inner component bearing axially
against said inturned terminal end on the side opposite from said
transverse shoulder.
14. The assembly defined in claim 13, wherein said axial retaining
means comprises a bead on said inner component.
15. The assembly defined in claim 12, wherein the length (e) of
said broaching serrations is substantially axially shorter than the
effective length (E) of said sleeve overlying said inner
component.
16. The assembly defined in claim 12, further comprising a bearing
surface on said outer component immediately adjacent said
transverse webs and a bearing surface on said inner component on
the side of its serrations opposite from said transverse shoulder,
the first mentioned bearing surface being received on the
second-mentioned bearing surface, one of said bearing surfaces
being smooth.
17. The assembly defined in claim 12, said inturned terminal end
being substantially radially inturned.
18. The assembly defined in claim 12, wherein said longitudinal
serrations are formed on said inner component.
19. The assembly defined in claim 12, wherein the length (e) of the
said broaching serrations is axially shorter than the distance (E)
from said smooth bearing surfaces to said transverse shoulder on
said inner component.
20. The assembly defined in claim 1, wherein said sleeve and said
inner component are in contact along a first smooth cylindrical
bearing surface substantially in radial alignment with said
transverse web and along a second smooth bearing surface between
the side of said serrations axially adjacent said transverse
shoulder and said transverse shoulder, the first smooth bearing
surface having a greater diameter than said second smooth bearing
surface.
21. The assembly defined in claim 12, wherein said sleeve and said
inner component are in contact along a smooth cylindrical bearing
surface substantially in radial alignment with said transverse web
defining means permitting slight torsional movement of said
transverse web relative to said hub.
Description
FIELD OF THE INVENTION
The present invention relates generally to assembly comprising an
axially extending hub and a radially extending web or disk on the
periphery of the hub.
Such an assembly may be used in the manufacture of a driven disk or
clutch plate of an automotive friction clutch, in which case the
web extends transversely relative to the hub. It may also be an
assembly for forming a pulley, in particular a PIV pulley, the web
of such an assembly forming a pulley side which is at least in part
frustoconical and extends at an angle from the associated hub.
DESCRIPTION OF THE PRIOR ART
Such assemblies with axial hubs and peripheral webs may be formed
in a single part. But the manufacture of such a part is relatively
expensive owing to the manufacturing process, namely forging, which
is not susceptible of high production rates and mass
production.
Accordingly, it has been proposed to make hub and web assemblies by
assembling two coaxial components. Such is the case with French
patent No. 1,096,443 and French printed patent application No.
2,256,686.
In each of these patents, for the assembly of two coaxial
components, the inner one most often forms a cylindrical hub and
the outer one is joined to the inner component by axial engagement.
One of the components comprises longitudinal die serrations adapted
to form in the other component complementary serrations during
assembly by driving the outer component axially onto the inner
component.
The outer components of the assemblies of these French patent
references in practice comprise a mere web or disk of blanked out
sheet metal and is therefore of reduced axially extent, limited by
the thickness of the web or disk.
Also, the die serrations are in practice usually provided on the
inner periphery of the outer component and during axial engagement
of the outer component on the inner component, the die serrations
cut into the surface of the inner component complementary
serrations which must mate with the die serrations. The metal of
the inner component is driven axially during this operation as
chips in the case of French patent No. 1,096,443 which are then
accommodated in a groove provided in the periphery of inner
component for this purpose. Or, the metal is driven back in the
form of bosses which gradually build up into an axial abutment on
the outer component to positively determine the ultimate position
of the outer component on the inner component.
To enable the cutting of such serrations the outer component must
be of considerable hardness, greater than that of the inner
component: in practice this means case hardening or carbonitriding
heat treatment of the outer component and annealing, or quenching
and tempering of the inner component.
Although these operations have given satisfaction in numerous
applications, they are unsuitable for others, namely those in which
the ultimate hub and web assembly is subjected to vibrations or
periodic forces, namely, rotating flexure or torsion. This is
precisely the case with rigid driven disks or clutch plates in
which no torsion damping means are interposed between the assembly
of axial hub and the peripheral disk and the corresponding friction
facings. In this case the peripheral disk may be subjected to
periodic forces of rotating flexure or torsion produced by a defect
in the web and/or misalignment between the axis of the driven disc
or clutch plate and the rest of the associated clutch.
Moreover, in German patent No. 193,444 it was proposed to provide
the outer component with a sleeve for axial engagement with the
inner component. Thus, the outer component comprises a sleeve in
contact with the inner component so that the length of engagement
on the inner component is axially extended and in any event
substantially longer than the mere width of the disk or web. The
rigidity of the assembly is considerably enhanced.
Still, in this German patent the axially position of the outer
component relative to the inner component is indeterminate.
Furthermore, the die serrations on the inner component extend along
the entire length thereof whereby the complementary serrations
formed on the outer component extend along the entire length of the
sleeve, and serrations on the outer component in engagement with
the serrations on the inner component are not only subjected to the
torque transmitted by one of the components to the other, but also,
any possible rotating flexure or torsion forces are liable to cause
play to develop between the serrations, detrimental to the service
life of the assembly.
OBJECT AND SUMMARY OF THE INVENTION
The main object of the present invention is the provision of an
assembly which overcomes these various drawbacks.
According to the invention there is provided an assembly of two
coaxial components comprising an inner component defining a
cylindrical hub and an outer component including a sleeve driven
axially onto the inner component. The longitudinal die serrations
on one of the components form generally complementary serrations on
the other component when the components are driven axially onto
each other. The novel assembly is characterized by the outer
component comprising an inturned terminal end and the inner
component comprising a transverse shoulder; the inturned terminal
end bears against the transverse shoulder for positively
determining the axial portion of the outer component on the inner
component.
Preferably, according to a second important feature of the
invention, the length (e) of the die serrations formed on the outer
component or the inner component is axially shorter than the
effective length (E) of the sleeve overlying the inner component; a
smooth bearing surface on the outer component remote from the
transverse shoulder tightly receives a corresponding smooth bearing
surface on the inner component remote from the transverse shoulder.
Thus the sleeve and the inner component are in contact along smooth
cylindrical bearing surfaces to the side of the serrations axially
remote from the transverse shoulder to permit slight torsional
movement of the outer component remote from the inturned terminal
end.
Owing to this additional feature of the invention there is
advantageously a disassociation between a first part of the
components which must withstand the periodic forces of rotating
flexure of torsion which is the part interconnecting the components
through the smooth bearing surfaces only, and a second part of the
components which transmits torque which is the part rotationally
joined by the serrations. The serrations are therefore spared
accordingly.
These two arrangements are advantageously employed together; the
advantages of the additional feature are all the more effective
when the inturned terminal end of the sleeve accurately positions
the outer component on the inner component.
Features and advantages of the invention will become apparent from
the description which follows, given by way of example, with
reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of a hub and web assembly embodying
the invention;
FIG. 2 is a longitudinal sectional view taken along broken line
II--II in FIG. 1;
FIG. 3 is a longitudinal view of the inner component;
FIG. 4 is a top plan view taken in the direction of arrow IV in
FIG. 3;
FIG. 5 is a detail view, on an enlarged scale, of the portion of
the inner component enclosed in the chain-dotted rectangle V in
FIG. 3;
FIG. 6 is a fragmentary sectional view taken along the line VI--VI
in FIG. 5;
FIG. 7 is a longitudinal sectional view of the outer component;
and
FIG. 8 is a longitudinal sectional view of the hub and web
assembly.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The drawings illustrate, by way of example, the use of the hub and
web assembly according to the invention in a clutch plate or driven
disk. As shown the clutch plate or driven disk is rigid, that is,
the disk 10 carrying the friction facings is rigidly secured by
rivets 11 to the hub and web assembly per se.
The hub and web assembly comprises an assembly of two coaxial
components received inside each other, namely, an inner component
13 which forms a cylindrical hub, and an outer component 14 which
is received on and joined to the inner component 13 and forms a
transverse annular web 15 carrying the friction facings disk
10.
The hub has internal splines 16 for cooperation with corrresponding
splines on a shaft for fixing the hub for rotation with the
shaft.
The outer periphery of the hub comprises, in succession, a first
cylindrical bearing surface 17 having a diameter D1, then a
transverse shoulder 18, a second cylindrical bearing surface 19
having a diameter D2 greater than diameter D1, then a transverse
shoulder 20 followed by a bevel or chamfer 21, a third cylindrical
bearing surface 22 having a diameter D3 greater than diameter D2,
then a fourth (interrupted) cylindrical bearing surface 23 having a
diameter D4 about that of diameter D3, and last of all, a fifth
cylindrical bearing surface 24 having a diameter D5 greater than
diameter D4.
Cylindrical bearing surface 23 has outwardly projecting teeth or
serrations 29 referred to hereinbelow as die serrations.
Preferably, the serrations 29 are longitudinal and define a
straight knurl, in other words, the tips 29 are parallel to the
axis of the hub and web assembly. Preferably, the serrations 29 are
formed by knurling or rolling, that is, by plastic deformation
radially inwardly and outwardly of an initial reference diameter
which is substantially equal to the diameter D5 of the cylindrical
bearing surface 24.
As illustrated in FIG. 6, the serrations define substantially
right-angle dihedral angles. Such a profile is an advantageous
compromise between a large number of serrations and facilitating
the knurling or rolling of serrations.
Cylindrical bearing surfaces 17, 22 and 24 on the hub are all
smooth and continuous surfaces.
Initially, i.e., prior to assembly, the cylindrical bearing surface
19 of the hub is smooth along its entire length, see FIGS. 3, 4, 5
and 8. After the outer component 14 is joined to the hub, as will
be described in detail hereinbelow, there is formed at its end
opposite from the transverse shoulder 20, a radially outwardly
extending swaged bead 32, see FIG. 2.
The outer component 14 of the assembly 12 has a sleeve 33 for
engagement with the hub 13. The sleeve 33 is formed in one piece
with the actual web 15 of the outer component, and a large-radius
fillet 34 connects the sleeve 33 to the web 15. As illustrated, the
web 15 extends transversely from the front end of the sleeve 33
relative to the direction the outer component 14 is engaged on the
inner component 13 as will be explained below.
The terminal end 35 of the sleeve 33 which is also the rear end
relative to the direction of engagement on the inner component 19,
is, according to the invention, inturned, or turned radially
inwardly toward the axis of the assembly. The inturned terminal end
35 is connected to the end of the sleeve 33 by a large-radius
fillet 36.
The sleeve 33 has an internal diameter D6 substantially equal to
the diameter D5 of the cylindrical bearing surface 24 of the hub
13, and the diameter D7 of the inturned terminal end 35 is
substantially equal to diameter D2 of the cylindrical bearing
surface 19 on the hub 13. As will be readily understood, the outer
component 14 may be easily stamped into an initially flat
blank.
In practice, the material of the blank is selected to be softer
than the material of the hub 13, and there is no need for any heat
treatment of the blank after stamping.
The inner and outer components 13 and 14 are assembled by driving
the outer component 14 axially onto the inner component in a press,
starting from the smallest diameter cylindrical bearing surface 18
in the direction of arrow F in FIG. 8. As the outer component 14 is
driven axially onto the inner component 13, the die serrations 29
on the inner component 13, by extruding and driving the material
and therefore providing good interengagement, to form substantially
complementary serrations mating with the die serrations. The
cooperating serrations intimately rotationally fix the inner and
outer components 13 and 14 together.
Thus, in practice, the internal serrations on the sleeve 33 are
formed without any substantial removal of stock or formation of
chips.
If necessary, however, a groove 38 may be provided at the rear of
the serrations 29 at the cylindrical bearing surface 22 on inner
component 13 for collecting such chips, as shown in phantom lines
in FIG. 5.
In practice, the outer component 14 is driven axially to the
opposite end of the inner component. At the conclusion of this
operation, the inturned terminal end 35 of the outer component 14
is in abutment against the transverse shoulder 20 on the inner
component 13, as is shown in solid lines in FIG. 8 and chain-dotted
lines in FIG. 5, thereby perfectly, positively defining the
position of the outer component 14 on the inner component 13.
As the outer component 14 is driven onto the inner component, the
swaged bead 32 is formed from the material of the inner component
13 by the driving material of the inner component into contact with
the inturned terminal end 33, for example, by means of an annular
swaging tool 40, in the direction of arrow F in FIG. 8, onto the
cylindrical bearing surface 17 on inner component 13 as shown by
chain-dotted lines in FIG. 8. The swaged bead 32 may, of course, be
either circularly continuous or divided into separate
angularly-spaced bosses.
In any event, the retaining means formed from the inner component
by swaging are in abutment against the inturned terminal end 35 of
the outer component 14 behind the inturned terminal end 35, in
other words at the side of the inturned terminal end 35 remote from
the transverse shoulder 20 of the inner component 13 against which
the inturned terminal end 35 is in abutment. The axial position of
the outer component 14 relative to the inner component 13 is thus
strengthened and fixed in either axial direction.
Components 13 and 14 are in meshing engagement along the entire
length of the die serrations 29 of the inner component 13 which may
be considerably greater than the thickness of the blank from which
the outer component 14 is stamped and therefore the thickness of
the web 15 thereof.
As will also be noted, the axial length e of engagement of the
serrations of the outer component 14 with the die serrations 29 of
the inner component 13, is shorter than the effective axial length
E of engagement of the sleeve 33 of the outer component 14 on the
inner component 13. The serrations on the outer component 14 are
axially offset relative to the web 15 thereon. In front of the
teeth on the outer component 14 in the vicinity of the web 15, the
sleeve 33 has a serrated cylindrical internal bearing surface 42
tightly received around the smooth cylindrical bearing surface 24
on the inner component 13. Bearing surfaces 24 and 42 are both
substantially in alignment with the web 15, and more particularly
as shown, in radial alignment therewith.
According to a preferred feature of the invention, these bearing
surfaces permit, whenever the circumstances may arise, the web 15
to withstand the periodic forces of rotational flexure without
being detrimental to adjacent serrations, by absorbing the forces
of rotational flexure before they reach the serrations.
The present invention is, moreover, not intended to be limited to
the illustrated and described embodiment, but may admit of various
modifications and alternatives without departing from the spirit
and scope of the invention.
Further, the field of the invention is not limited to clutch plate
or driven disks for clutches, but encompasses in general all web
and hub type assemblies where the components are driven axially
onto each other, for example, in the case of pulley halves of speed
change devices.
* * * * *